A tightly wound long solenoid carries a current of 15 A An e

Question

A tightly wound long solenoid carries a current of 1.5 A. An electron is executing uniform circular motion inside the solenoid with a time period of 75ns. The number of turns per metre in the solenoid...

Accepted Answer

For circular motion in magnetic field: $\ aligned T &= 2 meB \ B &= _0 n I \ n &= 2 me _0 I T \ &= 2 9 10^-311.6 10^-19 4 10^-7 1.5 75 10^-9 \ &= 250 \, turns/m aligned$...

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